Potty Training?

I started potty training Rylie when she turned two. She wasn't quite ready, it was too early for her and thus the training lasted for what seemed like forever. She wasn't completely independent until she was three. When I thought about potty training Anna, I thought I would wait until she really seemed really interested and really ready. I did not want it to drag on forever like it did with Rylie.
I figured we would wait until she was closer to three.
Well, recently, Anna has started telling me when she had a dirty diaper and when she was about to
go. She has also been interested in the potty and wants to go in whenever Rylie goes. I thought I would put her on it once just to see what her reaction would be. She immediately started trying to go potty! I was surprised that she really knew what it was for. Since then I have put her on the potty a couple of times. Tonight when I did, she went pee! She was so proud of herself and started laughing and clapping! I asked her if she wanted to call Grandma and Papa and tell them and she said "yes, Papa!" When she got on the phone with him she said "potty!" (and of course, "wuv you")
Now I'm not sure where to go. I'm not sure if I should go full force and start officially training her or wait until she's a little older. Any advice?